/* 
 * [New BSD License (BSD 3-Clause License)]
 * Copyright (c) 2012, Max Bechtold
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     - Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     - Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     - Neither the name of the Rel2Xml Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package maxbe.rel2xml.util;

import java.util.ArrayList;
import java.util.List;

public class Random {

	private final static long seed = 123223111;
	private static java.util.Random randA = new java.util.Random(seed);
	private static List<Integer> cVals = new ArrayList<Integer>();

	/**
	 * Computes non-uniformly distributed, random values in the range of
	 * [x..y].</br> Parameters accord with TPC-C spec 5.11 clause 2.1.6
	 * 
	 * @param a
	 * @param x
	 * @param y
	 * @return
	 */
	public static int nuRandom(int a, int c, int x, int y, java.util.Random rand) {
		if (!cVals.contains(new Integer(c)))
			cVals.add(new Integer(c));

		int bias = randA.nextInt(a + 1);
		int initial = x + rand.nextInt(y - x + 1);

		return (((bias | initial) + c) % (y - x + 1)) + x;
	}

	public static List<Integer> getCValues() {
		return cVals;
	}
}